The time between arrivals at an ATM machine follows an exponential distribution with = 10 minutes. Find the mean and standard deviation of this distribution.
A) Mean = 3.16, Standard Deviation = 3.16 B) Mean = 10, Standard Deviation = 10
C) Mean = 10, Standard Deviation = 100 D) Mean = 10, Standard Deviation = 3.16
Q. 2Would it make sense to have a control group that did not get any of the treatments described above?
What will be an ideal response?
Q. 3Given that x is a hypergeometric random variable with N = 8, n = 4, and r = 3, compute the variance of x.
A) .700 B) .538 C) .732 D) .469
Q. 4Suppose that the random variable x has an exponential distribution with = 1.5. Find the probability that x will assume a value within the interval 2.
A) .716531 B) .950213 C) .864665 D) .049787
Q. 5Suppose that the random variable x has an exponential distribution with = 1.5. Find the mean and standard deviation of x.
A) = 1.5; = 1 B) = 0; = 1.5 C) = 0; = 1 D) = 1.5; = 1.5
Q. 6Someone suggested that Max arrange the tanks so that six with the lowest temperature are on one end of the room, and the six with the highest temperature are at the other end of the room.
Explain how this could introduce confounding into the experiment.
Q. 7Given that x is a hypergeometric random variable with N = 10, n = 5, and r = 6, compute the mean of x.
A) 2 B) 4 C) 1 D) 3
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